Criminals are at least told what the charges are, and theoretically given a venue to contest them. It's easy to imagine police using the same excuse as Google:

Criminals are at least told what the charges are, and theoretically given a venue to contest them. It's easy to imagine police using the same excuse as Google: "we can't reveal exactly what you did wrong, since that would compromise our methods to catch criminals". If it wasn't for the fact that we aren't used to that "just being the way it is" in that case, we would probably shrug and accept it, too.